의자커버용 인테리어 직물의 객관적 태평가

구현진,Koo, Hyun-Jin 한국섬유공학회 2007 한국섬유공학회지 Vol.44 No.3

Textile fabrics used for interior and home contact with the human body frequently, hence the importance of comfort including hand should be considered. The assessment methods of comfort for the interior textile materials have not been studied even though there are many previous researches in the field of wear comfort. The relationships between the mechanical properties and interior fabric hands through mechanical testing and statistical analysis tech niques were identified. In this study, 18 kinds of chenille and jacquard fabrics used for seat cover were selected. The Kawabata Evaluation System was used to measure the mechanical properties for 18 fabrics and THV(total hand value) determined by subjective evaluation of 10 participants of an expert panel was also utilized. We ran the stepwise regression analysis to select the most significant mechanical properties and to develop the prediction models for hands. The tensile properties, bending, thickness and the mean deviation of surface friction were selected as the significant mechanical properties affecting fabric hands. In addition, the interior fabrics were categorized into five groups through the cluster analysis using four mechanical properties. The THV, constituent yams, and such fabric structural factors as pile floating area and pattern showed significant differences among five groups. The interior fabric hands are expected to improve through controlling the four mechanical properties by applying the structural factors for fabric design and construction.

지역사회주민의 생활 만족도와 이에 영향을 미치는 건강관련요인 연구

구현진,남철현,정호윤,하순희,배현숙,정현숙,이화수,Koo, Hyun-Jin,Nam, Chul-Hyun,Chung, Ho-Yoon,Ha, Soon-Hee,Bae, Hyun-Sook,Jung, Hyun-Suk,Lee, Wha-Soo 대한예방한의학회 2008 대한예방한의학회지 Vol.12 No.2

The current study was conducted to produce basic data for the policy establishment to improve the life satisfaction of residents in regional communities. The study subjected total 1,400 residents living in youngnam province in our nation for the survey by using convenience sampling. The survey took about 4 months started from March 1, 2007 to June 30, 2007. The abstract and conclusion of the result could be summarized as in below. 1. In subjective health status, 45.4% responded as normal, and the health status scored $2.68{\pm}0.67$ in 5 point scale(53.6 in 100 point scale). 2. The level of life satisfaction was found to show the score of $19.57{\pm}3.39$ in 30 point scale(65.2 in 100 point scale). Characteristically, the highest score was found in male in both age groups younger than 19 and in 20s, but lowest score was found in the age group in 40s(p<0.001). In the level of life satisfaction, 29.6% responded as satisfactory and 11.9% responded as not satisfactory. 3. In reviewing the life satisfaction by the health related characteristics, 65.7% of whom responded as very healthy answered satisfactory in life, and the life satisfaction was significantly high in peoples who do not smoke. However, the level was significantly higher in alcohol drinker than no alcohol drinker. People who have enough sleep tended to satisfy in their life, and the life satisfaction level of whom have leisure turned out to show superiorly high satisfaction level. 4. As the variables affecting on the life satisfaction, sex, age, education level, marital status, health status, stress level, life satisfaction level, healthy life activities and depression level were found, and the influence of these variables was 19.6%. As the above results demonstrate, the life satisfaction of residents in regional community was proportional to health status and highly affected by daily health life. So, the more attentions have to be made on health management and the self effort should not be neglected. Especially, since stress, depression level and leisure life did have effects on life satisfaction, more attentions have to be made on stress solving and on the development of leisure life programs. For the goal, the governments, related private organizations and specialized workforces have to make integrated efforts along with the health improvement project in large perspectives.

자동차 에어백용 원단의 수명예측

구현진(Hyun-Jin Koo),조항원(Hang-Won Cho),장갑식(Gap-Shik Chang) 한국신뢰성학회 2009 신뢰성응용연구 Vol.9 No.4

The airbag module is an inflatable restraint system that inflates within 0.05 seconds automatically in a collision to protect the occupants. The airbag fabrics used in the module are required to have the good resilience and strength and also to have retained at least 80% of mechanical properties after using longer than 10 years. In this study, we develop an accelerated test method in order to predict the lifetimes of airbag. In this test, we select temperature and humidity as environmental stresses by analyzing the failure mechanisms of coated and uncoated nylon 66 fabrics. It is found that the degradation of airbag fabrics is effectively accelerated under the combined conditions of high temperature and humidity. Analyzing the results of the accelerated test, the lifetimes of airbag fabrics are predicted to be longer than 10 years.

내후성 시험 조건에 따른 지오신세틱스 비교평가

구현진(Hyun-Jin koo),조항원(Hang-Won Cho),오정택(Jung-Taek Oh) 한국지반신소재학회 2014 한국토목섬유학회 학술발표회 Vol.2014 No.4

Geosynthetics for all applications have to be tested for resistance to weathering because polymers are generally degraded under the exposure to UV spectral region. EN 12224 and ASTM D4355 describe accelerated weathering tests with different light sources. EN 12224 is based on the 50 MJ/㎡ radiant exposure which is equivalent to one month’s exposure in southern Europe during summer. There are various approaches to reach the same radiant exposure given in EN 12224. The duration is required 320 h for devices with a combination of fluorescent UV lamps, 350 h for devices with UV-A lamps if the lamps are left on during the water spray and 430 h for devices with UV-A lamps if the lamps are turned off during the water spray. ASTM D4355 uses a xenon arc light source having a spectrum that simulates natural daylight, including the UV region. We have performed the accelerated weathering tests according to EN 12224 using combination of fluorescent UV and UV-A lamps, and ASTM D4355 using conventional weatherometers. In this study, we have investigated the effects of different light sources on degradation properties of non-woven geotextiles.

플라스틱 연직배수재의 굴곡조건하에서의 배수성능시험법 개발

구현진(Hyun-Jin Koo),장갑식(Gap-Shik Chang) 한국지반신소재학회 2013 한국토목섬유학회 학술발표회 Vol.2013 No.11

플라스틱 연직배수재의 굴곡조건하에서의 배수성능을 객관적으로 평가하기 위하여 굴곡 시험장비를 개발하였으며 굴곡형태, 굴곡부여 방식 및 pin 직경 등 굴곡조건에 대한 영향을 분석하였다. 이러한 연구결과를 바탕으로 현재 플라스틱 연직배수재의 굴곡조건하에서의 배수성능 시험방법의 국제표준화가 진행 중에 있다. The most important property of prefabricated vertical drains (PVDs) is the discharge capacity. After the installation of PVDs, water is discharging from compressible soil layers which causes a vertical deformation of the PVDs, resulting in buckling. However, there are many different practices are present all over the world for the testing of the discharge capacity of PVDs, especially in buckled condition. In this study, the effects of buckling shape, pin diameter and buckling procedure on discharge capacity were investigated to develop the standardized test method and apparatus for discharge capacity of PVDs in buckled condition.

지오신세틱스의 현장 내시공성 평가법 연구

구현진(Hyun-Jin Koo),조항원(Hang-Won Cho),배대근(Dae-Keun Bae) 한국지반신소재학회 2013 한국토목섬유학회 학술발표회 Vol.2013 No.4

The reduction factor for installation damage required for calculation of design strength of geosynthetics is usually obtained from the field test. Installation damages of geosynthetics occurred during backfill compaction are influenced by various factors such as geosynthetics, backfill materials and backfill compaction method. However field test considering these factors shows very low repeatability and reproducibility. This study suggests the pilot test method for obtaining the reduction factor of installation damage economically and efficiently.

생분해성 섬유소재의 복합 분해성 평가

구현진(Koo, Hyun-Jin),장갑식(Chang, Gap-Shik) 한국지반신소재학회 2015 한국지반신소재학회 학술발표회 Vol.2015 No.10

잉크젯 잉크의 수명예측을 위한 광열화 가속시험법에 관한 연구

구현진(Hyun-Jin Koo),조항원(Hang-Won Cho),지병철(Byung-Chul Ji) 한국신뢰성학회 2015 신뢰성응용연구 Vol.15 No.3

We have performed accelerated photo-degradation test using a 10-Sun level high irradiance Weather-Ometer<SUP>ⓡ</SUP> (10-Sun Ci5000) in an attempt to study acceleration and correlation between accelerated and service conditions for ink-jet ink. The accelerated test was used to predict lifetimes of ink-jet ink through the calculation of scaling factor for intensity of irradiance and duration of usage combined with estimation of lifetime distribution and inverse power model as a life-stress model. The lifetimes and acceleration factors for foreign and domestic inks were compared with each other. The results showed that the failure mechanisms and life-stress models for ink-jet ink were different among the color of ink which means that we might be in need of further study by color of inks.

소비자의 기질적 욕심이 무행동 관성에 미치는 영향: 예상되는 무행동 후회와 극대화 성향의 조절된 매개효과

구현진 ( Koo Hyunjin ),손영우 ( Sohn Young Woo ),임혜빈 ( Rim Hye Bin ) 한국소비자학회 2016 소비자학연구 Vol.27 No.5

무행동 관성이란 초기의 매력적인 기회를 놓친 이후에 마주한 후속 기회에서도 행동하지 않으려는 경향성을 의미한다. 본 연구는 소비자의 기질적 욕심과 무행동 관성 간의 관계를 예상되는 무행동 후회가 매개하며, 이와 같은 매개경로가 극대화 성향의 수준에 의해 달라지는 조절된 매개효과를 검증하고자 하였다. 이를 위해 총 251명의 참가자들에게 기질적 욕심 척도(Dispositional Greed Scale), 극대화 성향 척도(Maximization Scale)와 후속 세일 제품에 대한 구매의도를 묻는 무행동 관성 문항을 포함하는 설문을 실시하였다. 연구 결과는 다음과 같다. 첫째, 소비자의 기질적 욕심 수준이 높을수록 후속 기회에서 높은 구매의도를 보였다. 둘째, 후속 기회를 놓침으로써 예상되는 후회가 욕심과 구매의도의 관계를 매개하였다. 마지막으로, 소비자의 극대화 성향이 욕심과 예상되는 무행동 후회의 정적 관계를 강화시켜, 욕심이 예상되는 무행동 후회를 통해 구매의도에 미치는 매개효과가 극대화 수준에 따라 유의하게 변화하였다. 본 연구는 소비자의 기질적 욕심과 무행동 관성 간의 관계에 대해 처음으로 탐구해보았으며, 욕심과 무행동 관성의 관계를 설명하는 매개 및 매개된 조절 변인들을 추가적으로 검증함으로써 무행동 관성 현상에 대한 연구를 한층 더 확장시켰다고 볼 수 있다. 본 연구의 의의, 한계점 및 후속 연구 방향에 대해 제언하였다. Inaction inertia refers to a phenomenon that after having bypassed an initial attractive opportunity, people are less likely to act on subsequent similar opportunities. This phenomenon is considered as one of the negative side effects of sales marketing, and is a nuisance for retailers and marketers. Previous studies on inaction inertia have focused on the preconditions and contexts pertaining to the occurrence of the phenomenon. However, only very little attention has been paid to the effects of individual differences of the customers on inaction inertia, such as personal characteristics or decision-making styles. To address the issue, we aimed to examine the influence of consumers` personal characteristics on inaction inertia. Specifically, we explored consumers` level of dispositional greed on inaction inertia. Dispositional greed refers to an individual tendency to never being satisfied with what one currently has, and always craving for more. That is to say, people with high levels of dispositional greed would always want more than what they possess at present. Therefore, we hypothesized that greedier people would show higher purchase intention even in the face of less attractive and inferior opportunity because they would primarily focus on acquiring more products. It implies that greedier people might be less affected by the inaction inertia. Furthermore, we assumed that anticipated inaction regret would mediate the relationship between greed and purchase intention. According to previous research, regret is a negative emotion which is closely related to inaction inertia. Anticipated inaction regret is a type of regret that a person experiences when facing the bargains, anticipating how one might feel when foregoing the upcoming opportunity. According to previous studies, anticipating higher inaction regret leads to higher purchase intention under the inaction inertia contexts. As greedier people tend to want more, we presumed that they would report higher anticipated inaction regret. Taken together, we hypothesized that anticipated inaction regret would positively mediate the relationship between greed and purchase intention. In addition to the mediation model of greed, anticipated inaction regret and purchase intention, we hypothesized that consumers` level of maximizing tendency would affect the relationship between greed and anticipated inaction regret. Maximization refers to a style of decision-making, which is characterized by pursuing the best option through exhaustively searching and comparing the alternatives. Since maximizers want the best option, they are prone to feeling regrets, both before and after the decision-making process. Hence, we assumed that people with high maximization tendency would anticipate higher inaction regret, thus positively moderating the positive relationship between greed and anticipated inaction regret. In sum, our study aimed to explore the influence of consumers` dispositional greed on inaction inertia, by testing a moderated mediation model of anticipated inaction regret and maximization. We hypothesized that anticipated inaction regret would positively mediate the relationship between greed and purchase intention, and individuals` maximization tendencies would moderate the mediating effect of anticipated inaction regret. To confirm our hypotheses, we conducted an online survey via Amazon Mechanical Turk (M = 245). Using SPSS PROCESS macro, the moderated mediation model was tested. The results supported our hypotheses. Participants with stronger dispositional greed anticipated higher levels of inaction regret, and reported higher purchase intention. In addition, the mediating effect of anticipated inaction regret was greater for participants with stronger maximization tendencies. This research shed light on the psychological mechanism of inaction inertia by examining the impacts of consumers` individual difference variables. Additionally, this research is meaningful in terms of expanding previous studies of the impacts of affect on consumer behaviors by focusing on greed which was gained little attention to. Further implications, limitations and possible future studies were also discussed.

플라스틱 연직배수재의 배수성능시험법 국제표준화

구현진(Hyun-Jin Koo),장갑식(Gap-Shik Chang) 한국지반신소재학회 2012 한국지반신소재학회 학술발표회 Vol.2012 No.11

Prefabricated vertical drains(PVDs) are used to accelerate the settlement of clays and silts under a given surcharge loading. Therefore, the discharge capacity is the most important property for PVDs. According to EN 15237, the soil compression, taking place during the consolidation process, may cause buckling or kinking of the PVDs, which may seriously reduce their discharge capacity. However, the previously developed test methods are not enough to measure the discharge capacity of straight and buckled PVDs considering the installation and consolidation processes with acceptable repeatability and reproducibility. Therefore, it is necessary to develop the ISO standard test method considering the following factors which affect the discharge capacity: hydrualic gradient, static or stepwise cell pressure, test duration, creep effect and buckling geometry etc.